Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag' not found in /home/devmecseminars/public_html/mec/vendor/symfony/dependency-injection/ParameterBag/ContainerBag.php:19 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/symfony/dependency-injection/ParameterBag/ContainerBag.php on line 19